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Finding the Fourth Proportional to 1,420.23, 1,959.84 and 790.68

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Solution

The fourth proportional to 1,420.23, 1,959.84 and 790.68 is: 1,091.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.23 : 1,959.84 = 790.68 : x
  2. Step 2: Convert to fraction form
    1,420.23/1,959.84 = 790.68/x
  3. Step 3: Cross multiply
    1,420.23x = 1,959.84 × 790.68
  4. Step 4: Simplify right side
    1,420.23x = 1,549,606.29
  5. Step 5: Solve for x
    x = 1,549,606.29/1,420.23
  6. Step 6: Final answer
    x = 1,091.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.